every wing profile has a balance point, the problem is some (more likely non symmetric cambered and so called laminar rooftop) vary with angle of attack. To resolve this obvious issue NACA and subsequently NASA determined the designer of the profile would have to set a balance point, and moments around that point would be recorded with the lift/drag data.+/-
The elevator sets the wings angle of attack, the higher the angle of attack the more lift is generated, it couldn't be simpler.
its just a flow modification that increases lift until stall, but they are devices that hugely increase drag in that process.
If
the elevator is set to neutral the wing is just a wind vane and
produces no lift (or resistance) to the wind.
Even at zero lift it still has drag, its just that the drag vector is perpendicular to the wing. My problem with it is the 'sail' cant be reefed and that force cant be eliminated. So the broader question becomes, what is the quantity of that drag force in high winds and the resultant weight of the spar to carry it. Now parallel that weight/lift equation with that of an advanced but ordinary sail. Im still uncertain about which wins
All it takes is a little servo motor and indicator in the tail, basically it is just a trim tab.
Sometimes you see wings with servo paddles or spades for control surfaces,
I think this is similar
Even at zero lift it still has drag, its just that the drag vector is perpendicular to the wing. My problem with it is the 'sail' cant be reefed and that force cant be eliminated. So the broader question becomes, what is the quantity of that drag force in high winds and the resultant weight of the spar to carry it. Now parallel that weight/lift equation with that of an advanced but ordinary sail. Im still uncertain about which wins
All it takes is a little servo motor and indicator in the tail, basically it is just a trim tab.
Sometimes you see wings with servo paddles or spades for control surfaces,
I think this is similar
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Posted by: robriley@rocketmail.com
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